I am running Windows 7 and have an external usb HD connected for automatic backups. Last week I noticed the drive has duplicated from Drive Letter f-z. The same single drive. I have ran malwarebytes(0 infections), CCleaner and have also in regedit>under network>removed the drive letter. It worked for an hour or so, but now the drive has duplicated again. I didn't even reboot. The computer is not on a network and there is no logon script assigning drives.
Any assistance would be greatly appreciated.